New .BETA.-Pyrochlore Oxide Superconductor CsOs2O6
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概要
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The discovery of the new β-pyrochlore oxide superconductor CsOs<SUB>2</SUB>O<SUB>6</SUB> with <I>T</I><SUB>c</SUB>=3.3 K is reported. It is the third superconductor in the family of β-pyrochlore oxides, following KOs<SUB>2</SUB>O<SUB>6</SUB> with <I>T</I><SUB>c</SUB>=9.6 K and RbOs<SUB>2</SUB>O<SUB>6</SUB> with <I>T</I><SUB>c</SUB>=6.3 K. The <I>T</I><SUB>c</SUB> of this series decreases with increasing ionic radius of alkaline metal ions, imposing a negative chemical pressure upon the Os pyrochlore lattice.
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